Micro Drivven Combustion Analysis Tool (µDCAT) User`s Manual
Contents
1. Figure 11 Pressure Ratio Tab Drivven Inc 2009 e uDCAT Version 1 86 Speed rom Timer us Cyde RTQueue RTQueueError RawQueue RawQueueError SerialNumber fo Activated PlotScale No Change PlotStart o 23 Drivven Inc Viewing Trends and Summary Data Trends uDCAT The Trends tab shown in Figure 12 displays charts for a quick view of the historic data Any calculated parameter can be selected to see the historical trends The available values are displayed in the list box to the left of the trend Holding Shift or Ctrl allows for selecting multiple values to trend Changing the selection will reset the trends The listed available trends may be filtered using the controls below the list box Please note that trends are updated periodically Therefore not every cycle of data will be displayed in the trend P UDCAT User Interface vi Front Panel on UDCAT Ivproj My Computer pecu Measurement Setup Engine Setup Motoring Filtering Data Pressure Metrics General Pressure Metrics Heat Release aj 104 Amplitude Heat Release Pressure Ratio Pressure Ratio MEP Time Trends Summary See Files Noise amp Misfire Poto E 0 Cyde Figure 12 Trends Tab Drivven Inc 2009 uDCAT Version 1 86 24 Drivven Inc UDCAT Summary The Summary tab shown in Figure 13 displa2. Post Process Configure Figure 15 Post Processing Overview Drivven Inc 2009 e uDCAT Version 1 86 28 Drivven Inc UDCAT Opening TDMS Files in Excel National Instruments provides a free excel plug in that imports TDMS files Importing a file creates a multi page spreadsheet with all the data stored in the file shown in Figure 16 The first page contains a summary of all the groups and channels Each group has a page where each column is a channel of data Please note that Excel 2003 is limited to 256 columns and 65536 rows Therefore the custom properties displayed in the first 2 rows on the main page which contain all the calculation configuration information may need to be turned off Raw data channels may also be too long and will be truncated EI Microsoft Excel Book BH Eie Edit View Insert Format Tools Data Window Help agiHuiadgidia vvxkaa amp 7 S 2l man e fina E E About J33 v ke 1 A HUNC D E F Root Name Title Author Date Time Groups Description Summary 001 3 Group Channels Description Cylinder 1 38 Ensemble Average 1 Cylinder 1 Channel Datatype Unit Length Minimum Maximum Description Coefficient of Variance Mean NI ArrayColumn Standard Deviation Start Index Peak Pressure kPa abs DT FLOAT 5190 849976 6198 100342 2 641693711 5638 233765 198 5931473 LOC PP CAD DT FLOAT 15 525 28 26742744 1 815000057 0 684071794 PolyC DT FLOAT 0 985251635 1 079280943 1
3. Slot 2 AI 3 optional Measurement 9 Slot 3 Al 0 optional Measurement 10 Slot 3 AI 1 optional Measurement 11 Slot 3 AI 2 optional Measurement 12 Slot 3 AI 3 optional Measurement 13 Slot 4 AI 0 optional Measurement 14 Slot 4 AI 1 optional Measurement 15 Slot 4 AI 2 optional Measurement 16 __ __ Slot 4 AI 3 optional When using the DAQ device with uDCAT only the terminals described above should be used In order to take full advantage of certain hardware features UDCAT makes programmatic internal connections Connecting signals to other terminals or running other programs which interact with the DAQ device may cause unexpected behavior The National Instruments Measurements and Automation Explorer should be used to discover or change the name of the DAQ device and its physical channels The names of the device and physical channels will be used on the measurement configuration tab of the user interface Drivven Inc 2009 uDCAT Version 1 86 10 Drivven Inc UDCAT Running uDCAT This section of the manual covers the basics of starting setup and running uDCAT Before beginning the latest versions CalVIEW and uDCAT should be installer and activated Drivven Inc 2009 uDCAT Version 1 86 11 Drivven Inc UDCAT Starting uDCAT 1 Make sure CalVIEW is closed 2 Start2 Programs Drivven pyDCAT Launch uDCAT Target and CalVIEW 3
4. blue buttons on the CalVIEW interface This saves a file to the LabVIEW default data directory This is typically under My Documents abVIEW Data Calibration files have a cdl extension o To load a previous UDCAT calibration which was given a unique name and path copy the desired calibration file into the LabVIEW default data directory and rename it to uDCAT cdl Then start the uDCAT target application Please note that the calibration file is only read when the uDCAT Target Program starts How do I customize the user interface o The user interface is a standard LabVIEW VI It may be modified with LabVIEW development tools to meet user requirements The file should be saved in a new location so that updating uDCAT installation does not overwrite the changes A new CalVIEW cvsf may be created to automatically start uDCAT with the new user interface Please see the CalVIEW user s manual for details about the cvsf file Drivven Inc 2009 uDCAT Version 1 86 37 Drivven Inc UDCAT Why doesn t uDCAT start correctly o Verify that the appropriate version of DAQmx and LabVIEW Run Time are installed The installers are available on National Instruments website and listed at the beginning of this manual o Verify that CalVIEW is installed and activated Please see the CalVIEW user s manual for details on installation and activation of CalVIEW o Verify that uDCAT is activated Check the uDCAT Target Program front panel t
5. e 3600ppr 15000 E 3 10000 E x 5000 0 T T T T T T T T T T T T T T I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Cylinder Count Figure 22 Maximum Engine Speed USB 6251 amp USB 6259 The following formula can be used to estimate the performance of a multiplexing DAQ hardware device Dads 60 000 MSR N ER Where Speed Maximum Engine Speed rpm MSR Maximum Sample Rate of DAQ device aggregate kS s N Number of Measurements ER Encoder Resolution ppr Drivven Inc 2009 e uDCAT Version 1 86 34 Drivven Inc UDCAT Figure 23 shows the CompactDAQ hardware limitations The CompactDAQ system uses simultaneous sampling cards Therefore the DAQ hardware limitations are constant for any number of cylinders 35000 30000 25000 20000 15000 10000 Maximum Speed rpm 5000 0 T T T T T T T 0 500 1000 1500 2000 2500 3000 3500 Encoder Resolution ppr Figure 23 Maximum Engine Speed CompactDAQ The following formula can be used to estimate the performance of a simultaneous DAQ hardware device _ 60 000 MSR Speed d ER Where Speed Maximum Engine Speed rpm MSR Maximum Sample Rate of DAQ device kS s ER Encoder Resolution ppr Drivven Inc 2009 e uDCAT Version 1 86 35 Drivven Inc UDCAT Calculations The uDCAT calculations are described in detail in the DCAT User s Manual The manual may be downloa
6. Drivven Inc UDCAT single ended operation is required then the b pin of each input should be left unconnected Shielded cabling is recommended Table 4 Crankshaft optical encoder connections to the NI 9411 module Encoder Signal NI 9411 DB15 Connector Pin Encoder 5V optional Externally Supplied or Slot 5 NI 9411 Pin 4 5Vout Encoder Ground optional Externally Supplied or Slot 5 NI 9411 Pin 12 COM Encoder Z required Slot 5 NI 9411 Pin 2 P0 1 PFI 1 DI 1a Encoder Z Compliment optional Slot 5 NI 9411 Pin 10 PO 1 PFI 1 DI 1b Encoder Z required Slot 5 NI 9411 Pin 7 P0 4 PFI 4 DI 4a Encoder Z Compliment optional Slot 5 NI 9411 Pin 14 P0 4 PFI 4 DI 4a Encoder A required Slot 5 NI 9411 Pin 1 P0 0 PFI 0 DI 0a Encoder A Compliment optional Slot 5 NI 9411 Pin 9 P0 0 PFI 0 DI 0a The analog instrumentation signals should be connected to the NI 9215 analog inputs according to Table 5 The BNC version of the NI 9215 is recommended for ease of connection Shielded BNC cables are recommended Table 5 Analog instrumentation connections to the NI 9215 modules Instrumentation Signal NI 9215 Input Measurement 1 Slot 1 Al 0 Measurement 2 Slot 1 AI 1 Measurement 3 Slot 1 AI 2 Measurement 4 Slot 1 AI 3 Measurement 5 Slot 2 AI 0 optional Measurement 6 Slot 2 AI 1 optional Measurement 7 Slot 2 AI 2 optional Measurement 8
7. 076011777 1 037295341 0 014881893 PolyE DT FLOAT 0 884210229 1 106829375 2 8040151 1 000904739 0 037420694 Intake Pressure kPa abs DT FLOAT 40 03009701 109 6497002 9 226884842 75 88676262 9 335978508 Exhaust Pressure kPa abs DT FLOAT 57 17280006 129 7148895 7 633623362 93 58624649 9525361776 Max Press Rise kPa CAD DT FLOAT 739 2883301 1264 801025 8 340785265 978 3118286 108 7985229 MPR Location CAD DT_FLOAT 0 75 1 5 7 425747871 0 757499993 0 075000057 IMEP kPa DT FLOAT 204 4370499 241 8543091 2 588683426 221 8386841 7 656934977 PMEP kPa DT_FLOAT 26 38108921 13 73475409 8 221258879 20 537148 2 251216114 NMEP kPa DT FLOAT 186 6294708 219 9280243 2495105982 201 301506 6696914434 5 MRB CAD DT_FLOAT 0 292098999 0 207183838 63 04363632 0 063247835 0 053164981 10 MFB CAD DT_FLOAT 0 032730103 0 311576843 2280360746 0 14106125 0 042889405 50 MFB CAD DT FLOAT 0 538764954 1210098267 13 27857399 0 74751547 0 132345859 75 MFB CAD DT FLOAT 0 852653503 2 903182983 26 02818775 1385801017 0480931833 90 MFB CAD DT FLOAT 1 112411499 19 8550415 75 08928108 2 982174933 2 985724926 Max HRR CAD DT FLOAT 63 28506088 126 4829178 9 724574804 9142874336 11 85474157 LOC Max HRR CAD DT_FLOAT 268 875 254 625 1 882509649 263 4000092 6 61137414 Misfire DT_FLOAT 0 0 0 0 0 Cycle Number DT_FLOAT 33352 5 33426 75 0 048874358 33389 625 21 75861883 Speed DT FLOAT 1124 898102 1127 586456 0 038156094 1126 359283
8. 100 379211 999 857788 1 830078 0 032823 997 881653 990 620178 1 526367 0 024945 989 642883 993 714600 1 526367 0 006214 998 626160 1008 422058 2 135742 0 036174 1007 665955 1008 940125 2 135742 3 008071 0 017927 1009 057068 999 133728 1 831055 4 0 020655 0 031241 996 752869 990 070923 1 832031 989 960815 994 658752 1 831055 998 835144 1008 451782 1 831055 1009 013000 1009 07428C 1 830078 1008 695618 998 615662 1 526367 A 996 056580 989 979309 2 136719 57 800000 maneo mem one ass EE 1008 893921 998 799011 n 830078 995 715210 989 898987 1 832031 990 304443 996 000549 1 526367 999 717773 1008 716005 1 1009 222107 1008 076172 Figure 17 Summary Post Processor Example Front Panel Drivven Inc 2009 e uDCAT Version 1 86 30 Drivven Inc UDCAT Figure 18 Summary Post Processing Example Block Diagram Initialize the tables and plots Open the TDMS combustion data file Load the configuration data from the file Load the summary data from the file and populate the table and plot Area available for user defined processes Ar
9. 6259 BNC Terminals Encoder 5V optional Externally Supplied or 5V Screw Terminal Encoder Ground optional Externally Supplied or D GND Screw Terminal Encoder Z PFI 1 P1 1 Encoder A HEI 0 P1 0 or APFI O Measurement 1 AIO Measurement 2 Al 1 Measurement 3 AI 2 Measurement 4 AI 3 Measurement 5 AI 4 Measurement 6 AI 5 Measurement 7 AI 6 Measurement 8 Al 7 Measurement 9 Al 8 USB 6259 only Measurement 10 Al 9 USB 6259 only Measurement 11 Al 10 USB 6259 only Measurement 12 Al 11 USB 6259 only Measurement 13 Al 12 USB 6259 only Measurement 14 Al 13 USB 6259 only Measurement 15 Al 14 USB 6259 only Measurement 16 Al 15 USB 6259 only Drivven Inc 2009 uDCAT Version 1 86 8 Drivven Inc UDCAT CompactDAQ The CompactDAQ chassis may be used with uDCAT if the proper hardware configuration is provided The CompactDAQ chassis should be configured with the first four slots filled with one to four NI 9215 modules and the fifth slot should have a NI 9401 or NI 9411 digital input module as shown in Table 2 sd SD LL mg Figure 2 CompactDAQ System Table 2 Module placement in the CompactDAQ chassis CompactDAQ Slots CompactRIO Modules Slot 1 NI 9215 required Slot 2 NI 9215 optional Slot 3 NI 9215 optional Slot 4 NI 9215 optional Slot 5 NI 9401 or NI 9411 required Slot 6 Empty Slot 7 Empty Slot 8 Empty When using the NI 9401 digital
10. 86 32 Drivven Inc UDCAT Post Processing Raw Files The uDCAT Post Process Raw File program shown in Figure 21 displays and processes the raw TDMS data file into a new summary TDMS data file The configuration settings can be changed and the statistics recalculated The front panel has a similar look as that of the uDCAT user interface It also contains several controls related to loading files scrolling through cycles of data and processing the data to a new summary TDMS file To begin load a raw data file using the Load File button in the lower left corner After loading all setup information is placed into the appropriate controls and indicators and a single cycle may be viewed along with the calculated values for that cycle based on the setup information originally provided Ay setup parameter may be changed to see the resulting calculation updates The slider at the bottom of the screen determines which cycle is displayed and processed Keep in mind that the cycle number does not necessarily start from 0 but is referenced to the start of data collection within uDCAT Therefore the first cycle within the raw data file may be much larger than 0 To process a range of cycles select the Process File tab and set the two sliders on the Process Range control to specify the range of cycles to be included in the results Then press the Process File button to begin processing and visualize the results in table and chart formats The user ma
11. CalVIEW should automatically start in Mini Mode 4 UDCAT Target application launches This program must run in the background while using UDCAT 5 Make sure that the InitOK and Activated lights are green on the target application P UDCAT Target Program vi el RT Queue ST Queue disk Ful inito Activated Figure 3 IDCAT Target Program a If the InitOK light remains red please contact Drivven If the Activated light remains red a dialog box will appear asking you to connect your hardware and retry activation If the activated light continues to fail please contact Drivven 6 Press the Ok button on the CalVIEW dialog box indicating that the target application is running T The uDCAT user interface starts running Drivven Inc 2009 e uDCAT Version 1 86 12 Drivven Inc UDCAT Measurement and Engine Setup Before collecting and analyzing data the Measurement Setup and Engine Setup tabs must be configured While on these setup tabs no data is collected or processed Data collection and processing will automatically begin when the user is on any of the following tabs To see a description of a control or indicator hover over the parameters with the mouse cursor to see the tip strip or context help window message The context help window may be accessed by pressing ctl H The uDCAT user interface also provides a sidebar of information to the right of the tabs that is always visible The
12. E R 33 Expected PerformanCe taimenia ella Bl E ia a ee 34 Ee te EE 36 Frequently Asked Ouestons i 37 Drivven Inc 2009 uDCAT Version 1 86 2 Drivven Inc UDCAT Introduction The micro Drivven Combustion Analysis Tool UDCAT is a combustion analysis application built from the Drivven Combustion Analysis Toolkit DCAT While the DCAT is a toolkit for programming custom engine control and analysis applications using LabVIEW uDCAT is an installed executable which interfaces automatically to USB DAQ and CompactDAQ devices from National Instruments Furthermore uDCAT does not require installation of LabVIEW development tools in order to run Instead uDCAT only requires installation of the free LabVIEW run time engine and DAQmx device drivers uDCAT is designed as a low cost easy to use portable engine combustion analysis tool UDCAT was designed to work with the USB 6251 USB 6259 and CompactDAQ devices However it is compatible with any device that is fully compatible with the National Instruments DAQmx device driver While monitoring combustion analysis parameters uDCAT allows streaming of raw data or summary data to file continuously by cycle count time or file size Raw data files are stored in National Instrument s popular TDMS format and include all channel configurations engine geometry and custom test data to allow complete reconstruction of the test environment at a later date Cycle by cycle summaries of analysis par
13. 0 57303299 Message DT_STRING Error DT_STRING NiSas5IamsromSI8 9uewsoms Kegel 1 H 1 H 1 E H 1 1 1 2 2 22 23 24 2 2 2 2 2 E 3 E 33 Ensemble Average Channel Datatype Unit Length Minimum Maximum Description NI ArrayColumn Start Index Pcyl amp Pa 1 DT FLOAT Inject Current A 1 DT FLOAT Rail Pressure bar 1 DT FLOAT Temperature K 1 DT FLOAT Heat Release J CAD 1 DT FLOAT MFB Fraction 1 DT FLOAT ta mN Summary_001 root Cyinder 1 Ensemble Average Ready Figure 16 Summary File Import to Excel Drivven Inc 2009 e uDCAT Version 1 86 29 Drivven Inc UDCAT Post Processing Summary Files The uDCAT Post Process Summary File example shown in Figure 17 and Figure 18 is set up to display all of the configuration information and allow the user to easily insert their own post processing code The front panel contains a tab control and several buttons to load and view files The slider controls the cycle displayed in the graphs and tables The buttons labeled for processing and saving do nothing in the example but are set up to allow the user to easily add processing and saving code for their specific needs The example is not set up to allow the user to change the setup parameters because the properties have already been applied to all the calculated values DCATAdvanced Post Process Summary File vi File Edit View Project Operate Tools Window Help rx 019551
14. 0029 a D b HeatTransferCor IntakeTemp o fado ExhaustTemp c Pre ChamberVolume iter 1 K jo TempProfile constent 0 HeatTranCoeff W m2x o Constant Tal KI cie fo Coe do 70c K fo 2c StartMethod b rm KI EndMethod Heat Release Pressure Ratio Trends Summary Save Files J constant jo StartAngle CAD Constant EndAngle Drivven Inc 2009 e uDCAT Version 1 86 1 1 300 359 5 Figure 10 Heat Release Tab Speed rpm Cyde RTQueue EH RT QueueError I RawQueue EH RawQueueError RTAlignBuffer DAQLoopTime 0 us RawLoopTime o us RTLoopTime H us SerialNumber Bo Activated 100 RollingAvgSize 20 Updatestats PlotScale No Change PlotStart o PlotEnd 22 Drivven Inc Pressure Ratio UDCAT The Pressure Ratio tab shown in Figure 11 shows calculations which are a form of heat release based on the ratio of the calculated motoring pressure and the actual pressure P UDCAT User Interface vi Front Panel on uDCAT Ivproj My Computer SEOL Measurement Setup Engine Setup Motoring Filtering Data Pressure Metrics Heat Release 1700 PRGO 0 Pressure kPa abs 3 s Pressure Ratio Trends g d s d amp B S Pressure Ratio
15. AlignBuffer v jo StartPolye CAD g 1540 EndPolyE CAD 1520 StartExhaust CAD 1500 EndExhaust CAD 1480 JET 1460 17 1 1 D 1 LI I StartIntake CAD 30 E E 150 200 250 300 355 5 Endinteke CAD PP kPa abs Mean SerialNumber Bo TO oer ole IM este tr i II IT II 40 45 50 SS 60 70 75 80 85 90 95 99 o Activated PolyC Window men D D 1 T D 1 ju 3k 1 D D D 1 Ret 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 99 PolyE Wind d Figure 9 Pressure Metrics Tab Drivven Inc 2009 e uDCAT Version 1 86 21 Drivven Inc Heat Release UDCAT The Heat Release tab shown in Figure 10 displays in table and plot format the Heat Release Rate HRR and Mass Fraction Burn MFB percentages The dropdown menu HeatReleaseMethod selects one of several heat release methods Different configuration parameters will be shown for each heat release method The StartMethod and EndMethod define how the start and end of combustion are determined For more details on the heat release calculations please refer to the Calculations section of this manual P UDCAT User Interface vi Front Panel on UDCAT Ivproj My Computer gt n Measurement Setup Engine Setup Motoring Filtering Data Pressure Metrics HeatReleaseMethod Single Zone jo SmoothingFactor 9c PolyECor Heat Transfer jHaves SAE86
16. DRIVVEN Micro Drivven Combustion Analysis Tool UDCAT User s Manual Version 1 86 April 2009 Drivven Inc e 12001 Network Blvd Bldg E Suite 110 San Antonio Texas 78249 e USA Phone 210 248 9308 Web www drivven com E mail info drivven com Drivven Inc UDCAT Table of Contents teste 3 Installing and Activating DCAT eene nennen nennen nns 5 DCAT Hardware Setup iii 6 USB 6251 USB 6259 IM Gees 7 usen m 9 RunningipDdGAT i iii ai eet ceu np d nhat eek hen Ede Ue it 11 starting TL RE 12 Measurement and Engine Getup nennen 13 Measurement Setup enne nn sn en nnne nentes nnn nenene 13 Be Ee EE 15 Motoring TDC Alignment and Pegging sene 17 alu eL 19 Viewing All Waveforms iessessseiseeesises sees tenen nita nnns th nana addam ain ananas andan 20 Calculation Setup and Results enne nnn 21 Pressure Metris 2 22 beagle Laga eed Ee dede 21 Heat Release id eni ded pas dedi eni cedi dp oie id od eed ce ceed 22 Pressure Ratios ni adipi tet n e mete p nero saris 23 Viewing Trends and Summary Data 24 WOM OS xcs settee CT 24 INI 25 Saving Data xt latorem o e oO Ee D Eee 26 Post Processing Data Files nem ee a Cem a eo e re 28 Opening TDMS Files in ExCEel ie 29 Post Processing Summary FileS ener 30 Opening a Raw Data He EE 32 Post Processing Raw Files aaien aaae e E E A E
17. I O module the crankshaft optical encoder must be powered externally and a ground reference from the encoder must be connected to a COM pin of the NI 9401 module The encoder should be connected to the NI 9401 module according to Table 3 Shielded cabling is recommended By default all NI 9401 DIO pins are configured as inputs Table 3 Crankshaft optical encoder connections to the NI 9401 module Encoder Signal NI 9401 DB25 Connector Pin Encoder Ground required Slot 5 NI 9401 Pin 1 COM Encoder Z required Slot 5 NI 9401 Pin 16 PO 1 PFI 1 Encoder Z required Slot 5 NI 9401 Pin 22 P0 5 PFI 5 Encoder A required Slot 5 NI 9401 Pin 14 P0 0 PFI 0 When using the NI 9411 digital input module the crankshaft optical encoder may be optionally powered by the module If the encoder is powered from the module power 5 to 30 VDC must be supplied to the Vsup and COM screw terminals of the module Vsup is internally reduced to 5V and available from the D Sub connector The encoder should be connected to the NI 9411 module according to Table 3 Please note that the NI 9411 module inputs are optionally single ended or differential pairs Some optical encoders provide complimentary differential signal outputs which enable greater noise immunity when connected with differential digital inputs Table 4 shows the connections to be made for single ended or differential operation If Drivven Inc 2009 e uDCAT Version 1 86 9
18. PalycOutORRange o Sek rolveoutoRange o ralviioh O ceolvoutoffange TDC Check jo Peak Pressure o CalculatedTDCOffset CAD TDC Fine Adj CAD kPa abs E th n 3 n 1525 1500 1480 7 0 0755191 Pressure_motor 1 0 2 1 1 300 359 5 1 0 8 0 860917 kPa abs 0 PegAverage CAD 1 01 PegPolyC E i Pressure motor 0 0755191 HAv Drivven Inc 2009 e uDCAT Version 1 86 Figure 6 Motoring Tab 7 0 2 0 4 0 6 Boe no EH 1650 1625 1600 1550 1525 1500 1480 1 n i 0 8 0 1 86091 EH RT QueueError I RawQueue WM RawQueueError awLoopTime us RTLoopTime 0 SerialNumber Bo Activated 100 RollingAvaSize 20 Updatestats PlotScale No Change PlotStart o Plotend 18 Drivven Inc UDCAT Filtering The Filtering tab shown in Figure 7 allows configuration of up to 16 filters The filter number specified in the Measurement Setup tab for each measurement corresponds to the filter number configuration on this tab There are several types of filters that may be selected with the FilterMethodX drop down including Rolling N Cycles Forward and Reverse IIR FIR Filter with Rollback and Boxcar A comparison of these filters is beyond the scope of this manual When a filter type is selected only the configuration parameters for that filter
19. To Save File 1 Set Cyde Range 2 Set the File Path 3 Press Save Results Save Results 4 Process File View Cyde LoadFile Drivven Inc 2009 e uDCAT Version 1 86 ylinder H JI Activated ey 3099350 Timer ms 797 07 Speed RPM Figure 21 uDCAT Post Process Raw File Front Panel 33 Drivven Inc UDCAT Expected Performance The data processing performance of uDCAT will vary depending on the following factors CPU speed RAM size and speed Hard drive speed Operating system and additional running applications DAQ hardware limitations sampling rate response times Engine speed Encoder resolution Cylinder and measurement channel count Calculation configurations VVVVVVVVV Figure 22 shows the limitations of the USB 6251 and USB 6259 DAQ hardware These devices use a multiplexed analog to digital converter and therefore share the maximum sample rate among the enabled measurements Therefore the number of cylinders measurements reduces the maximum engine speed that can be recorded The resolution of the encoder also affects the maximum engine speed The following charts only account for the DAQ hardware and not the computer processing capability Actual performance will vary based on the computer hardware used to calculate the results and stream data to disk 30000 amp 360ppr E 25000 amp 7 20ppr gt 20000 ree TURPE 2
20. ameters can also be logged to TDMS files for later review TDMS files may be opened and analyzed in Excel using a free TDMS file plug in Drivven Inc 2009 e uDCAT Version 1 86 3 Drivven Inc UDCAT DCAT Features Channel Configuration and Engine Geometry Supports 1 M Series device for multiplexed sampling of signals engine synchronously cylinder pressure etc Individual channel scaling features o Cylinder Assignment o Cain o Gain Offset o Polynomial o Table Lookup Any channel may be assigned to all cylinders as a pegging reference Complete set of engine geometry inputs for cylinder volume calculation Online motoring test assists with engine geometry verification Pre Processing Cylinder alignment of data Data scaling to engineering units Broad range of signal filtering options Cylinder pressure pegging options Pressure Metrics Peak Pressure and Location Polytropic coefficients of compression and expansion Maximum Rate of Pressure Rise and Location Pressures at IVO and EVC Gross MEP Pumping MEP Net MEP Heat Release Analysis Methods include o Single Zone o Single Zone Dual Transducer for pre chamber engines o Single Zone Heat Transfer o Single Zone Dual Transducer Heat Transfer o Modified Rassweiler and Withrow Locations of Mass Fraction Burned 5 MFB 2596 MFB 50 MFB 7596 MFB 9096 MER Custom Maximum Heat Release Rate and Location Variety of heat transfer correction methods In cylinder te
21. ded from the Drivven website at http www drivven com visitor_ download Manuals DCAT 20User s 20Manual pdf Drivven Inc 2009 e uDCAT Version 1 86 36 Drivven Inc UDCAT Frequently Asked Questions How do add my own calculations to uDCAT o WDCAT is a fixed application However the open source post processing examples can be used to build a custom post processing program which implement custom calculations This requires LabVIEW development tools and custom programming o Please contact Drivven about the Drivven Combustion Analysis Toolkit which provides full featured open source LabVIEW example implementations of the toolkit The toolkit allows a customized combustion analysis application to be built from scratch or integrated with full authority engine control applications using National Instruments PXI controllers and DAQ cards How do I add a diesel injector current probe trace or any other signal to my display o To display and save any signal simply add it to the measurement setup and associate it with the appropriate cylinder It will be displayed on the data tab and saved in the raw data file The MeasurementType should be set to undefined The signal will be sampled engine synchronously according to the encoder resolution How do I save the current configuration of UDCAT o To save the current uDCAT settings use the CalVIEW Save Current Calibration as Default purple or the Save Calibration As
22. e Filter SyncX refers to 1 of 16 filters that are defined on the Filtering tab Each measurement may be set to the same filter or to its own filter Each measurement may be disabled with the Disable SyncX button When disabled no data is recorded on that measurement and the configuration information for that measurement is not included in the saved files The EncoderResolution and TDC Offset must be defined for the uDCAT to function properly TDC Offset must be in terms of whole encoder pulses between the Z pulse and TDC compression of cylinder 1 Positive values mean that TDC is after the Z pulse Please note that TDC Offset is a user specified value and the Actual TDC Offset is the closest possible value To set a partial encoder pulse TDC offset use the TDC Fine Adj on the motoring tab The DAQmx device sample triggering must be setup for the Encoder A signal The rising or falling edge of the Encoder A signal should be selected with the A Edge parameter This determines the edge of the Encoder A signal where the analog measurement is sampled If the Encoder A signal is connected to PFIO input then select PFIO for the A Trigger parameter and no further configuration is required for the Encoder A signal If the Encoder A signal is connected to the analog APFI input then A Threshold and A Hysteresis voltages must be set A Threshold is the Encoder A signal voltage at which the internal digital trigger signal goes high A Hysteresis is the Encode
23. ea available for user defined saving Aarons Drivven Inc 2009 e uDCAT Version 1 86 31 Drivven Inc UDCAT Opening a Raw Data File The uDCAT Open Raw Data File VI shown in Figure 19 and Figure 20 is a simple example which opens the raw data file and then allows the user to display a single cycle for a single cylinder The plot automatically formats to show the measurement names originally saved with the data Note that all the setup clusters are available and may be used for post processing or they may be modified before post processing The example can easily be modified to run all the cycles for all the cylinders in order to process an entire file To automatically process the entire file replace the While Loop with two For Loops that run for each cycle and for each cylinder respectively DCATAdvanced Open Raw Data File vi Front Panel on DCATAdvanced Ivproj My Computer Ele Edit View Project Operate Tools Window Help BRO ded doc C Test 000 tdms dm stor DCATAdvanced lvproj My Computer Waveform Graph ActPlot Ip Nessurementiame pPiot lame ER E ows Waveform Graph rel waveform Graph RPM Time ms Cycle o S lastcyee First Cyde yde Er eese DCATAdvanced lvproj My Computer IP Figure 20 Open Raw Data File Block Diagram Drivven Inc 2009 e uDCAT Version 1
24. eadArea and CrownArea set to 100 assumes that the head portion of the combustion chamber and piston top are flat and meet at TDC HeadArea and CrownArea set to 120 assumes that those surfaces have 20 more surface area than the bore area These parameters should only be adjusted above 100 if heat release is calculated using heat transfer Misfire detection monitors the absolute peak combustion pressure or the NMEP The misfire calculations must be enabled by pressing the MisFireCalcs button on the Measurement Setup tab Each option for MisfireMethod is described below Peak Pressure Absolute Misfire is detected when the measured peak pressure falls below the specified PressureThreshold NMEP Absolute Misfire is detected when the calculated NMEP falls below the specified PressureThreshold Peak Pressure of Historic Misfire is detected when the measured peak pressure falls below a PercentThreshold of a rolling average of the measured peak pressure HistoryLength specifies the number of cycles to use for the rolling average NMEP of Historic Misfire is detected when the calculated NMEP falls below a PercentThreshold of a rolling average of NMEP HistoryLength specifies the number of cycles to use for the rolling average Drivven Inc 2009 uDCAT Version 1 86 15 Drivven Inc UDCAT User Interface vi Fri nel on UDCAT Ivproj My Computer Drivven Inc 2009 e uDCAT Version 1 86 Figure 5 Engine Setup Tab Pres
25. ed in the National Instruments Measurements and Automation eXplorer MAX The serial numbers are typically displayed in hex represented by a Ox in front of the number Please indicate if the number is in a different radix The device serial number must be e mailed to license drivven com along with your name company name address and telephone number Please allow 1 3 business days to validate your account and generate a key An activation key 32 Characters ex 9DCJ RN79 QBEE TPKW BBAB GT3Z RXYC CFCW will be generated by Drivven and sent to the customer via reply email The key will contain only the following characters ABC DEFGHJKLMNPQRSTWXYZ34AT S8 The activation key may expire at a specific time if generated for evaluation purposes The activation key must be place in a text file called uDCAT dat in the c ni rt system directory The directory may not exist and may need to be created by the user Drivven Inc 2009 e uDCAT Version 1 86 5 Drivven Inc UDCAT DCAT Hardware Setup UDCAT is configured to utilize a USB M Series Devices USB 6251 BNC and USB 6259 BNC or the USB CompactDAQ chassis with up to 4 NI 9215s and a NI 9401 or NI 9411 Any fully DAQmx compatible card may work but only the listed devices have been tested Drivven Inc 2009 uDCAT Version 1 86 6 Drivven Inc UDCAT USB 6251 USB 6259 M Series The USB 6251 and the USB 6259 are M Series DAQ devices available in a BNC form facto
26. er Synchronous MAP Synchronous MAP is identical to Constant except that a Manifold Absolute Pressure MAP sensor is sampled engine synchronously and averaged over the same angular range MAPAvg not displayed MAPAvg is used instead of the Constant mode user specified PegPressure PegPressure is not used This method requires that a MAP sensor be connected to one of the measurement channels and configured on the Measurement Setup tab It should be assigned to all relevant cylinders using the AssociatedCylinders SyncX check boxes Polytropic Uses the change in volume and pressure to determine the absolute pegging offset This method calculates the pegging offset over the window specified for calculating the PolyC values on the Pressure Metrics page The user must enter an accurate value for the polytropic coefficient of compression in PegPolyC Please note that the TDC offset will effect the calculations because the cylinder volume is used Drivven Inc 2009 uDCAT Version 1 86 17 Drivven Inc UDCAT Measurement Setup Engine Setup Motoring Filtering Data Pressure Metrics Heat Release Pressure Ratio Trends l Summary Savefiles o MotoringCylinder MotoringAverageSize fo PP motor kPa abs LPP motor CAD fo PolyCLow fo PolyC_motor R fo PolyELow fo PolyE_motor jo dPolyLow D dPoly o MotoringAverage o IMEP_motor kPa o PMEP motor kPa o PalyChigh O
27. isplayed statistics may be turned off by un checking the control next to the table Each individual plot can be configured for auto scaling or manual scaling of the Y axis by right clicking on the scale and checking or un checking the AutoScale menu item There are three parameters on the bottom right side bar for configuring the Crank Angle Degrees CAD scale Pressure Metrics The Pressure Metrics tab shown in Figure 9 displays the results of basic analysis of each cylinder pressure wave form The angle parameters at the top of the tab are required for calculating each pressure metric The table based calculated parameters are as follows PP kPa Peak Pressure LocPP CAD Location of Peak Pressure PolyC Polytropic Coefficient of Compression PolyE Polytropic Coefficient of Expansion MPR kPa CAD Maximum Pressure Rise LocMPR CAD Location of Maximum Pressure Rise Intake kPa Average pressure during intake valve opening Exhaust kPa Average pressure during exhaust valve opening P UDCAT User Interface vi Front Panel on UDCAT Ivproj My Computer amp ajn Measurement Setup Engine Setup Motoring Filtering Pressure Metrics Heat Release Pressure Ratio Trends Summary Save Files Speed rpm Timer us 1660 PPMethod Cyde 1640 StartPP CAD d RTQueue 0 EndPP CAD 35 WM RTQueueError a I RawQueue SE 15807 EE RawQueuetrror jo EndPolyC CAD v 1560 1 RT
28. k Pressure or Most Probable The CalculatedTDCOffset is displayed and the TDC_Fine_Adj parameter may be adjusted to achieve a CalculatedTDCOffset of zero TDC_Fine_Adj may be use to correct partial encoder pulse offsets However setting TDC_Fine_Adj to a non zero value may reduce the overall performance of the system because it causes a re sampling of the measurement signals by linearly interpolating the arrays of data UDCAT provides several methods for pegging the cylinder pressure measurements Pegging refers to dynamically adjusting the cylinder pressure offset It is useful when using sensors that measure a dynamic pressure instead of an absolute pressure Each selection of PeggingMethod is described below None No pegging method is implemented and the measured pressure wave form as calculated from the specified scaling parameters on the Measurement Setup tab is used Constant The average cylinder pressure PressureAvg not displayed over a specified crank angle range is calculated The center of the averaging range is specified by PegLocation in CAD The PressureAvg is calculated over a range before and after PegLocation specified by PegAverage in CAD The total angular range used to calculate PressureAvg is twice PegAverage The difference between the specified PegPressure and PressureAvg PegPressure PressureAvg is displayed in the PeggingValue table for each cylinder and is added to the entire pressure wave form for each cylind
29. meters for saving two types of data sets The left side of the tab is used for saving raw data Raw Data consists of the absolute voltages measured directly from each channel The raw data is streamed to disk without any processing Therefore the data is not scaled or aligned to the cylinder However every configuration parameter from the setup and calculation tabs is also saved to the raw data file so the test environment can be recreated in post processing The right side of the tab is used for saving summary data Summary Data is the set of values calculated every cycle such as pressure metrics and heat release The statistics are also calculated and saved in the file The ensemble average of the scaled and aligned waveforms is also saved with the summary data Raw data and summary data may be recorded simultaneously The cycle number and time stamp which is recorded in both file types can be used to align the summary data with the raw data Both raw data and summary data types have identical file saving configurations The raw data file saving parameters will be described below Raw_Path Defines the full path to the directory for storing the file Raw Filename Defines the name of the raw data file A suffix of XXX tells uDCAT to append a file number to the end of the name The file number will be assigned and incremented according to Raw StartCounter Raw Counter and Raw ResetCounter Raw SaveMethod Selects the method for de
30. mperature estimation Drivven Inc 2009 e uDCAT Version 1 86 4 Drivven Inc UDCAT Installing and Activating uIDCAT Recommended System CPU 1 6 GHz Dual Core or Greater OS Windows XP Windows Vista Memory 1024MB HDD 2 GB Free Disk Space USB 2 0 for USB devices Software DAQmx 8 8 LabVIEW Run Time 8 6 CalVIEW 1 86 Display 15 wide screen 1280 x 800 dpi DAQmx 8 8 http joule ni com nidu cds view p id 1085 lang en LabVIEW Run Time 8 6 http joule ni com nidu cds view p id 1244 lang en CalVIEW 1 86 http www drivven com visitor_download Software CalVIEW1 86 zip UDCAT 1 86 http www drivven com visitor download Software uDCAT1 86 zip It is assumed that users of UDCAT are familiar with internal combustion engine concepts common practice for acquiring combustion related data as well as combustion analysis methods However the uDCAT is designed so that users with no LabVIEW experience can run the application UDCAT requires Drivven s CalVIEW Calibration toolkit for LabVIEW to operate CalVIEW must be installed and licensed before uDCAT will operate To license CalVIEW a computer ID found in the CalVIEW help menu under activate must be e mailed to license drivven com An activation key will be provided Please reference the CalVIEW User s Manual for details on setting up CalVIEW p DCAT must also be activated in order to enable its components The device serial number is used for activation It may be locat
31. nder specified in DisplayCylinder The data is aligned with TDC scaled and filtered The undefined measurement types selected by MeasurementType SyncX on the Measurement Setup tab are displayed on this tab according to the selected associated cylinder This is the only tab where undefined measurement types are displayed p LI amp en Summary SaveFies o Speed rpm Measurement Setup Engine Setup Motoring Filtering Data Pressure Metrics Heat Release Pressure Ratio Trends 10 Pict D fee ES b Cyde 3 5 I RTQueue WEM RTQueueError 1 1 RawQueue WEN Ra vQueveerror RTAlignBuffer DAQLoopTime o us RawLoopTime j 0 us RTLoopTime i o us SerialNumber to Activated 100 RollingAvgSize 0 5 0 5 d 0 7 D D J D I D D 1 D DH 1 i D 1 D I 1 D 1 CH T 0 0 250 5 1125 1752245 27533253 5 44 25 4 75 5 5 255 5 Fi 75 8 8 25 9 9 25 9 7510 PlotStar CAD ERIE mew Ao nsoaycyinder Figure 8 All Data Tab Drivven Inc 2009 e uDCAT Version 1 86 20 Drivven Inc UDCAT Calculation Setup and Results Many of the combustion analysis calculations require additional setup The additional setup parameters may be found on the following tabs The individual numerical results are displayed in the tables having columns for each cylinder The arrays of angle based data are displayed in plots Each calculated table value has rolling statistics associated with it The d
32. o verify that it is activated correctly o Manually start the application Please see the CalVIEW user s manual for more details 1 Launch the uDCAT Target Program It cam be started from the start menu or found at C Program Files Drivven uDCAT uUDCAT exe 2 Open CalVIEW Within CalVIEW define the Target IP address as 127 0 01 or your computer IP address 4 Within CalVIEW set the Host VI to C Program Files Drivven uDCAT User Interface uDCAT User Interface vi 5 Within CalVIEW set the pairing file to C Program Files Drivven UDCAT UDCAT Pairing par 6 Within CalVIEW start the Host VI Why am getting DAQ errors o Make sure that the hardware is set up properly in the Measurements and Automation Explorer and that the Measurement Setup tab has the proper physical channel names o Verify that the device is not being used for other DAQ tasks Why are the buffers or queues overflowing o The buffers fill when the computer system hardware is not able to keep up with the program demands A combination of faster CPU faster hard drive or additional RAM will alleviate the problem o Raw Queue This buffer fills when data cannot be streamed to file as fast as the DAQ Loop rate Try saving less data or allow the queue to empty before saving more data o RT Queue or NC Queue These buffers fill when the combustion analysis calculations cannot be completed as fast as the DAQ Loop rate Try disabling some of
33. r A signal voltage at which the internal digital trigger signal goes low The DAQmx start triggering and gating must be setup for the Encoder Z signal The rising or falling edge of the Encoder Z signal should be selected with the Z Edge parameter Drivven Inc 2009 uDCAT Version 1 86 13 Drivven Inc UDCAT This determines the edge of the Encoder Z signal where the Encoder A sampling begins If the encoder is mounted to the crankshaft then press the Z_1 rev button If the encoder is mounted to the camshaft then leave the Z_1 rev button depressed The combustion analysis calculation sets may be enabled and disabled depending on the specific requirements of the testing program Please note that some of the calculations from one group may be required as inputs to another group For example heat release with heat transfer requires the cylinder temperature calculations PressureMetrics Enables the calculations contained in the Pressure Metrics tab PressureRatio Enables the calculations on the Pressure Ratio tab MEP Enables calculation of Mean Effective Pressures GMEP PMEP NMEP The MEP calculations are displayed on the Summary tab CylTemp Enables the calculation of estimated cylinder temperature for the heat transfer calculations This group must be enabled if heat release is calculated with heat transfer HeatRelease Enables the calculations contained on the Heat Release tab Misfire Enables the calculations related to misfi
34. r that provides a simple interface to many combustion and test cell sensors Figure 1 USB 6251 BNC The instrumentation signals should be connected to the USB 6251 USB 6259 according to Table 1 The crankshaft optical encoder may be optionally powered by the USB DAQ device 5V and DGND screw terminals The maximum current draw is 1A If the encoder is externally powered then the encoder Z and A signals must have their BNC connectors properly connected to the encoder ground Shielded BNC cables are recommended The USB DAQ device When using the DAQ device with uDCAT only the terminals listed in Table 1 should be used In order to take full advantage of certain hardware features UDCAT makes programmatic internal connections Connecting signals to other terminals or running other programs which interact with the same DAQ device is not prohibited but Drivven cannot guarantee compatibility between uDCAT and such programs The National Instruments Measurements and Automation eXplorer MAX should be used to discover or change if desired the name of the DAQ device and its physical channels The names of the device and physical channels will be used on the measurement configuration tab of the user interface Drivven Inc 2009 e uDCAT Version 1 86 7 Drivven Inc UDCAT Table 1 Instrumentation connections to USB 6251 USB 6259 Instrumentation Signal USB 6251 USB
35. re detection Misfire detection is reported on the Summary tab vi Front Panel on DCAT Ivproj My Computer UA A GO fe fe LJ Activated Setup Runstat 100 RollingAvgSize DI v KIT n o f j S b m S op a b m b m b f g b m El Figure 4 Measurement Setup Tab Drivven Inc 2009 e uDCAT Version 1 86 14 Drivven Inc UDCAT Engine Setup The Engine Setup tab shown in Figure 5 is a collection of engine geometry parameters The EngineName ProjectName and Operator are strings that are saved in the output file for reference They are not use in the program The CylinderCount should be set for the number of cylinders that are being analyzed The CylinderTDC array will show only the number of elements for the specified CylinderCount Each element of the CylinderTDC array should be specified with the relative CAD offset of each cylinder at TDC compression with respect to the first cylinder Typically the first cylinder will have a CylinderTDC of 0 and the other cylinders will have positive values spaced throughout the engine cycle Recall that the TDC_Offset parameter on the Measurement Setup tab specifies the global TDC offset of the first cylinder with respect to the encoder Z pulse The engine geometry and valve timings are used throughout the program for various calculation sets and should always be fully specified HeadArea and CrownArea parameters are entered as percentages of the bore area For example H
36. sidebar shows status information such as engine speed and data queue statistics that are useful at all times Measurement Setup The Measurement Setup tab shown in Figure 4 contains all of the configuration information for each measurement channel and the crankshaft encoder The total number of measurement channels SyncChannelCount should be specified first For each measurement a physical channel type scaling and associated cylinder should be set The PhysicalChannel_SyncX is the device and channel name recognized by DAQmx Ex Dev1 ai0 The MeasurementType SyncX allows the program to separate the specific measurements that are used for the calculations A type of undefined should be used if the measurement type is not listed Several options are available for the scaling of a measurement Many of the defined measurement types require that the scaling factors be in terms of a specific engineering unit The AssociatedCylinder_SyncX check boxes determine which cylinders the channel should be associated with Some measurements like cylinder pressure should only be associated with a single cylinder Others may be associated with multiple cylinders such as manifold pressure Please note that associating measurements with multiple cylinders may slow down the system The MeasurementName is used to store the data in the file and for display The units of undefined measurement types may be set to a text string that is used for display Th
37. sure of Historic DAQLoopTime O bel RawLoopTime o us RTLoopTime o fus SerialNumber Be o Activated Setup R Ru te 100 RolingAvgSize 20 UpdateStats PlotScale No Change PlotStart lo cap PlotEnd lo CAD 16 Drivven Inc UDCAT Motoring TDC Alignment and Pegging The motoring tab shown in Figure 6 provides a place to check some of the key motoring parameters to ensure that the day to day variation of the engine is within acceptable ranges Various motoring pressure metrics are displayed here When the Motoring tab or any other tab to the right of the Engine Setup tab is selected data acquisition begins according to the configuration of the first two tabs MotoringCylinder should be set to the cylinder number to be monitored A MotoringAverageSize may be used to average a specified number of cycles for performing the calculations on this tab Increasing this value will reduce the rate of updates The motoring polytropic coefficients of compression and expansion PolyC_motor and PolyE_motor are calculated here The crank angle ranges to be used for calculating these parameters are entered on the Pressure Metrics tab PolyC_motor and PolyE_motor are displayed graphically on the PV diagram Tolerance ranges may be set for these parameters as a quick check of engine geometry and TDC setup When motoring the TDC_Check method may be set to Peak_Pressure Spline Interpolation Half Pea
38. te that the arguments should be enclosed in quotations if it contains spaces Drivven Inc 2009 uDCAT Version 1 86 26 Drivven Inc UDCAT Table 6 FileConverter exe Flags Flag Argument Description p n a Commands FileConverter to write raw data to cvs q n a Commands FileConverter to write summary data to cvs r Raw Data File Path Defines the raw data file path S Summary Data File Path Defines the summary data file path Example RawCMD string C Program Files Drivven uDCAT FileConverter exe r PATH p UDCAT also includes the LabVIEW project and source code that was used to generate FileConverter exe The name of the project is Custom File Converter lvproj and can be opened from the Start gt Drivven gt uDCAT menu The LabVIEW development tools are required to open and modify the project Users may use this project as a starting point to create a custom file converter or post processing utility Additional command line options may be added or the utility may be operated using front panel If an exe utility is desired then the LabVIEW Application Builder toolkit is required as a plug in to the LabVIEW tools UDCAT User Interface vi Front Panel on UDCAT Ivproj My Computer l Sju Measurement Setup EngneSetup Motoring filtering Data PressureMetics HeatRelease PressureRato Trends Summary Save Fies Speed rpm o Timer us Ban Path Summary Path D Cyde c pa
39. termining the end of saving raw data to file The options are as follows Continuous Continuously save data while the Start StopRawFile button is pressed N Cycles Saves data for number of cycles specified by Raw MaxCycles Timed Saves data for a time specified by Raw MaxTime Size Saves data until a file size specified by Raw MaxSize is reached Raw Comments String inserted into the raw data file Raw StartCounter Specifies the starting file number to be filled in for XXX in the filename Raw ResetCounter Resets the file number to Raw StartCounter Start StopRawFile Starts and stops the file saving process EnableRawCMD Enables execution of a command line when file save finishes RawCMD Command line that executes when enabled and a file save finishes The following variables may be used within the RawCMD text string PATH Used within the RawCMD text string This variable will be replaced by Raw PathRaw Filename before RawCMD is executed UDCAT includes a command line utility called FileConverter exe This utility opens and converts the tdms file to a cvs file When used as a raw data file converter the data is aligned to the cylinder TDC offset and each column is a different measurement The flags and arguments to the utility are listed below in Table 6 A flag letter must be preceded with a dash and immediately followed by equal For example r PATH defines the raw data file path using the PATH variable Please no
40. the calculations or reducing the encoder resolution o RT Align Buffer or NC Align Buffer These buffers will fill when the combustion analysis calculations cannot be completed as fast as the combustion events The calculation time must be less than 60 N RPM Noyl seconds N Strokes per Cycle RPM Engine Speed in RPM Noyl Number of Cylinders Ex 4 storke 10000RPM and 16 cylinders 750us Try disabling some of the calculations or reducing the encoder resolution Drivven Inc 2009 e uDCAT Version 1 86 38
41. ts c pats I RTQueue Raw FileName Use Time Format or XXX for File Number Summary FileName Use Time Format or XXX for File Number DD some mos Tiras Raw Comments Summary SaveMethod Summary Comments Raw SaveMethod Continuous EE Raw QueueError fonts NI msn 0 Raw MaxSize MB 0 Raw_MaxTime s fo by Raw_MaxCydes Raw Counter 0 Raw StartCounter C Raw ResetCounter fo Summary MaxSize MB 0 Summary StartCounter fo Summary MaxTie s fo Summary_Counter 0 Summary_MaxCycles C Summary ResetCounter EnableSummaryCMp SummaryCMD PP kPa abs Mean Max Drivven Inc 2009 e uDCAT Version 1 86 Figure 14 Saving Data Tab WEN DAQError E RawError WEE ProcessError FreeDiskSpace D M8 mm DiskFull DAQLoopTime H us RawLoopTime 0 fus RTLoopTime 0 us SerialNumber fo 3 Activated 100 RollingAvgSize 20 UpdateStats PlotScale No Change PlotStart 0 CAD PlotEnd o CAD 27 Drivven Inc UDCAT Post Processing Data Files UDCAT saves data in National Instruments standard TDMS file format TDMS files provide a powerful and flexible way to store and retrieve data National Instruments provides many resources on their website to edit and view TDMS files outside LabVIEW in programs such as MatLab and Excel The uDCAT tool contains several VIs used to stream data from the TDMS files
42. type will be shown The filters are applied to the measurements before being displayed on all other plots An ensemble average of each measurement may also be used by pressing the EnsembleEnable button When using the ensemble average a specified number of cycles EnsembleSize are averaged at each crank angle and the averaged results are used in the calculations Increasing EnsembleSize will reduce the rate at which the calculations are performed d UDCAT User Interface vi Front Panel on UDCAT Ivproj My Computer elei e n Measurement Setup Engine Setup Motoring Filtering Data Pressure Metrics Heat Release Pressure Ratio Trends Summary Save Files Speed rpm Timer us 1680 1 Cyde RTQueue 1660 EN RT QueueError RawQueue 1670 1650 Fieri Fiteri4 Fiteris Fiter 16 sR Filter9 Fiter10 Fiterit Fiter 12 iex Fiters Fiere Filter7 Filter 8 1620 Filter 1 Fiter 2 Fiter3 Filter 4 1610 1600 s FilterMethod1 None 1590 1580 3 fo Frequencyi Tei mm o FilterOrderi Pressure kPa ab SerialNumber Bo Activated B EnsembleEnable n EnsembleSize T D 1 m 150 200 250 300 359 5 Figure 7 Filtering Tab Drivven Inc 2009 uDCAT Version 1 86 19 Drivven Inc UDCAT Viewing All Waveforms The Data tab shown in Figure 8 displays all the measurements associated with a single cyli
43. y save the summary data by specifying a file name in the Results File Path control and pressing the Save Results button T Post Process Raw File Measurement Setup Engine Setup Raw Data Processed Averages Speed 1 Speed 2 Pre Process Speed 3 Pressure MEP Heat Release Pressure Ratio Misfire Process File Processed Trends Spee A KEE 796 609558 796 609553 796 799 171082 799 171082 799 171082 799 3 Ke 794 456543 794 456543 794 1 212898 1 212898 1 212898 1 21 0 152258 0 152258 0 152258 0 15 200 00000 200 000000 200 000000 797 069702 797 069702 797 069702 200 797 795 648353 795 649353 795 649353 797 33429 797 334290 797 334290 795 797 794 994995 794 994995 794 994995 797 838928 797 838928 797 838928 794 797 794 640381 794 640381 794 640381 797 268795 797 268799 797 268799 794 733765 794 733765 794 733765 794 797 794 798 026794 798 026794 798 026794 798 0 795 090027 795 090027 795 090027 795 797 68780 797 687805 797 687805 797 794 993164 794 993164 794 993164 794 798 037354 798 037354 798 037354 798 795 178040 r 1 1 300 359 9 Process Range _ ea rr 200 CycleCount E J 1845 Results File Path
44. ys a single table of all calculated values and associated rolling statistics The values in the summary table are a collection of the same table values from the previous tabs Please note that the Mean Effective Pressure MEP results and the misfire results are only displayed in the Summary tab table Below is a definition of the MEP calculations IMEP Indicated MEP over the firing portion of the cycle defined as 180 to 180 CAD PMEP Pumping MEP over the portions of the cycle defined as 360 to 180 and 180 to 360 CAD PMEP is a negative value NMEP Net MEP resulting from IMEP PMEP NMEP is effectively over the complete cycle defined as 360 to 360 CAD UDCAT User Interface vi Front Panel on uDCAT Ivproj My Computer Cyli Cyl2 Cyl3 Cyl4 Cvl5 Cvl6 Cyl Cvig Cylg Cy10 Ted Te Le Cyil4 PP kPa abs Mean Max WEN DAC Error EH RawError MEI ProcessError FreeDiskSpace DAQLoopTime 0 fus RaviLoopTime H fus RTLoopTime 0 fus SerialNumber A Activated 100 RollingAvgSize 20 UpdateStats PlotScale No Change PlotStart D CAD J Plotend jo CAD Figure 13 Summary Tab Drivven Inc 2009 e uDCAT Version 1 86 25 Drivven Inc UDCAT Saving Data The Save Files tab shown in Figure 14 provides configuration para
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